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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0d22d8cae72d8decc8ca0e98ff7b7ddd4eb6a8eb40a9b190837b26ac831233' 
  AND token = 'g7IyO35vf+9hrd5zVUfstNqKZvOcW2iqFS0bBUwMQbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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