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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19279140a9f61500565f6dba4b153eafc965ee9fa65c05164d760e08c36fac5c' 
  AND token = 'eaUcrfa+kVZCEY0mMAdfPIhrQqo0Q7J1lk9yQS/AAn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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