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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c462e2cdffbbf8df3dd5ba693d5ad203a06dc363454872f836a357be3998ac' 
  AND token = 'njap0Ui8MtK4OK1BitYFrKWQmWZszr5ZP5qERE9VUM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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