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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a7b249f105b4fade669ae45e3c9b374ae1e607e1bd46d60748f7c7de3efe54' 
  AND token = 'BIaan/NLa18EKYxzH8LCbgjeQU98vwDHj9M4g1IOsoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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