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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72d358b0cb9ec50eb1e36b0a18c665f0ed26b0cb6b8915163697339e129aa26' 
  AND token = 'LLOwKm2K5eOsvjEyfH47IkEOkjNPNswvt82pvMvmKtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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