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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f538e36cc93367081c9499d5cd55c958fb9b7257d9c0f16ddbcc2bf4c00c6b' 
  AND token = 'QScU8IDvllG6jcSxZ8G+vbib6uJU6ytPHYlTJNF4CjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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