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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e623723ea1728be0792c66019f87ddcdc6a7e781f4b025c4e5bcbfef9e19254' 
  AND token = 'DBUB08ezJUP0IaStHw00jVEzcB2SPqRtFffSe+lO/iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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