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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71f3dce65b9d30e24e360ce818988a94385eb6a962258f3c10f30fc6d0dba8c' 
  AND token = '2nfg0U86mpWGt7BesCh8zFbaV89k7V1+HuG2Wmv5QD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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