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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5302956ed370c6b1060c674a73b76ba1525c3b1b46c89a4db188e63817a7824' 
  AND token = 'iD8Ej6wyMeO7vc+qiXcsikiPFoRXYItkOucMTu8NIEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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