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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81b67331b94b1c67207657b24bb4c1b6a6db15fbde4fab3688ec97af3998cb5' 
  AND token = '3je4SB7qkh3vnVaDNGnQX/EtPj2M/huEV4JLCw/ce3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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