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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6862f3a85e99f00d7f4da393f1008269aa3307832ac1ad0e05e833baf1cac7' 
  AND token = 'oVDalxP8Z5/4oJRW2wFd6XKE6QdCilKKte2Eiw9S01Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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