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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee11a6a06d3595d8ab2d36208d21cc5e3d70b7dd6813102a95102ca337a385ff' 
  AND token = 'kl0lruHUzzEHzPRhvekrxJTfuRtIWj28JZ6kBA0Y/Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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