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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315a4835f2092d2f188c81dcf83faae7b1bd1d9f730da0966f9e8772bf7724ad' 
  AND token = '6TFACRbIa9HmZKG9iuBs4DTtTClBI12zHFMO89TzsMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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