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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a6cc90303b3da05b098812581c6c346be72e713b617c8116e2d8b95811bc8e' 
  AND token = 'YX8/s7JouEfdiDVSI23YXHVkvyhRPsoWIXzhEg9GFrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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