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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb0638e4ce850c1f85dd712f619a13b859084f55d6eb3867a7eb76a05310ef0' 
  AND token = 'i0c/h7sbgFjcIu4XraGrrtuIrXvJeYka+TwRKkZ1ltI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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