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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf18860f291f79142da93a254d4e56829549f475eabf88c6fde692da7d725b94' 
  AND token = 'o8kbPe0dwB8WwXwxpeD+iF+Dh1wKwq8ZAtF8rj9+1eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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