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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc2bf0d0262daf735b05516f4b7645520dcb09286a8e76fa1b7d54d44bb8ff9' 
  AND token = '4JLduQPqFYYJM76WSTNZb7Cb9UnWzstv6lAzz83g5x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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