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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd470c3594585542561ab7fa7fb1a345c6fd8d24599f1ef1d173709a1cb611d72' 
  AND token = '7+Vkku1adkf0LXZ5DvALwwMWJAJfTMgJX+aEY/3sffI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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