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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d7a251831870c3aa9137b93460cdaf0bb26c8c1957813958e863cf77d7ce2f' 
  AND token = 'v7SxULAOv5P7kY6wdqC1DkS7PqDHn0abXddYJisJUjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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