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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dae05d1731326ebd643eca3c94a116201138186e678ce0a75720e57f21bbbd7' 
  AND token = 'vtTXUCtLBqiqIisitwa0xmvNRfmfDL+T7kbLddlLXgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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