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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f59bb58e7e49d1de12b644634a903c4a9583b3acb51ad9f26644a5c466bb1e1' 
  AND token = 'XEQIgGI9pBl+HCoJs28HPhjjTrpIw05yvHAT4ixi5KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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