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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad4f48f148a41851d149c85daa5d59c5574e43fc7b34a3b013c2d6c75307551' 
  AND token = 'tH4mPeDfP8ATn8MiY5xDmJisYZ5cdm7ULqq26n7mjr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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