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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f3c74d44031322b92ce8033592ba3da92285c0bcde9369c278d5702c581fbe' 
  AND token = 'b2z013Hvgin9xlGf13hmqLKIbBn8SzHtO+NtPOR3VMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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