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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdc9df35c1f63632c1752f600b07783e2e08b12f82265509620736ed8ee457e' 
  AND token = 'f6nqegNElrVGA68pihjq5zxyjZXCtnkur3saekNe6Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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