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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbe06e35bab7e1775940a441132158009f110645c0c85a4ba4a5a82b3893504' 
  AND token = 'L8noyxJZhjT8p3GKw/lr6IUv9hBcf7E2A6OLb0Delhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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