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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429f6a3ca3fc3bbbe9dd73a89a6d82f070d120ae789f6457d5804d03f71d23ee' 
  AND token = 'HeursgOj9oO2nkCRxX1kdH7BQlAOeqc5IQPcW20a5Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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