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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251e1431f63714556b04fb5c87dff21197777d081067fecc80ad7af23f6ac32b' 
  AND token = 'X3cQc3UEc02y2E49gY+sP3tEW1Z0c+QauJvXnnYN7aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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