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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56dbbdc9773221d794f4e54aa591630145ab4cfc11158d0caa5f077cbabb835' 
  AND token = 'Y7dJ7kb+3ezSNdK1OyPgGN3a5PuBKGUiXpeVFuWgb28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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