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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29274ebfeab1244a0936f65e937a27db20e4d082b735fc9fb2c593b4fe7e63f8' 
  AND token = 'dym+5jW1jTx10q2xCClRnXqfSp9SOKzZl5iclYaSO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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