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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7447eacde1c66b5d37e896d581500935b0ec5904834385092131147316b7c106' 
  AND token = 'UuGzZxwghVh5xa1smu++Txz3RttyYB5yonJS7P3juMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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