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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31777ea27702b21e7aeda0a92a36ddf26aa22d144251b0c28ca9bff8c60fbe0' 
  AND token = 'twhE651Al7+VWgLEYvsmIqYKKYCRUqFVu9Cu5q75AhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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