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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc4d238681a1b4f4ef02309767ed5e5a1b8318312cb581aab8f544e25fed93a' 
  AND token = 'G79ur3dFRrlEsVn9XhD1X/5hS9uWp/4quBd5P1RNJ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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