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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8e2e3180f3678c12c41f6b75342401c6aa4bd7c84dc29fee06edf3f77875c8' 
  AND token = 'apPp6FmjcXFJP2A+sKzSAqWTOxhP79KVDJ1yO1RXyQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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