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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd102384b4f7946dfc5fb38c4122fc188d78560ec9e6cf99fc4dfe07bc847a525' 
  AND token = '8T0Gfj+yegVADfQyrLqDrxjX/ieA0pAGqFUTVd6yzsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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