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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84207ffaa99492033057f47d5717e37573aaf5daf244d31fc91f63b5a76ee39' 
  AND token = '7pTAT42H3wipcvGUW0FYIqrX68Z+oNM6hEqj5EhaD9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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