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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998fdbc9795d2f1d0420bed858b48b9a5ad8bfc2edef7be913142801efd78413' 
  AND token = 'YgH93kwg/8c/ecogJNk/9cc/oOqWHuRXbo0X7s0+rI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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