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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8a995b4d76f562ec5785157b46831c0ad4690378bb1794b671705a5ba19050' 
  AND token = 'TNcczB40d7z23CQcXrvjlGWYHIp0WVMezCSfgEUXpx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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