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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f15371d4967d37a57a27dbc0dec34c9d9bdf117adab594de0ffc506b8d314c7' 
  AND token = 'nnkBes4tLsPnL6406HWStWZq6xoT4n5E4gzj8xE3cQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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