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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19abfd19ed9d73ce79397e6f65d462220086c9728af7bace26eda4b9860c2d10' 
  AND token = 'ab9WqMz3kQiK0JBs0yXxVYB0oxeJSMKP8WXDzYn1noA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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