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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328a3245504ad89c1e18cde3ce304d23f708e4d1fd6c05b7d11d30e5a81f11f0' 
  AND token = 'xDpxrsydOjWCixdMIC2veutAftd/rrZwRoZM1PoT7sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}