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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd97badcb6a8e69f910086a28cbef334f3ac2aa765d43d58faf24e52e38f1e4' 
  AND token = 'bO+MDmVD/Qlull3BkQcKj9PqsEdsS02EitMG16/JH8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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