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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b521c7a130ec23b23c7b070296d8a831ec2139964c35ab3c9ccb03c58d5ddf' 
  AND token = 'hm09tQ9/W2YfpwPHmWY/gqfndE/4uNgpSTP9Ub092WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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