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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822bdfdd473b9fb473540247eda3431a2dae13c30ed58657b968155055925cdb' 
  AND token = 'XRanb1MO/t+kQhTa8/L+sV8CNPvzo+VXAAQyl+aGyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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