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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8578becba4652c48f6db95b75982f512ee7357efe103132612159a8e6639bae0' 
  AND token = 'bzwva5yy36ydpw7tTIJgNUUToedABlhNl+1e3B9jtKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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