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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc54d55158ecb222c8c726ec44f6f0eac264724f1bc99b8cf106cdf5b355e97' 
  AND token = 'BnuWLcis6XFTl1iUXvBD2JgLv1Y3gUz5Rt5s5Pe7EPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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