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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1a9829a27cefb60fb327850035c95e0ed9ec5a3ae1352494799fef4d019bb6' 
  AND token = 'kzEgDjgUA4ulc9y3Wnnt8Zv/4UKjv9M10HB/9XInEXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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