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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5986fefad02404c15f84c99990cf71844c68a003fa53e0389a6901d89e81f47f' 
  AND token = 'fVHbbp9wwc4fCVTLDiMQw99zHaGdjrFVV4SqJTtL2d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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