SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccccb665f9651cfe30832fe8bee66a7c48317496aa46c32862fdc7fd0ab74984' 
  AND token = '/v/lGuk4KIvXL+ga5VLDSROqUQH4nd7UoAuEM5IJUSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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