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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865e11dcc3c64da0a671f660ec1d9474a5dcefd8150e33efb987f7e82d0f493d' 
  AND token = 'HHDM0xBbXKyy/u3RYu0UDcKVGelnzvN9pxdI3VCVycs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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