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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79433bd9d9469457f0344e3fa79ae231d323fcc81cc61a6bb14a0cc810ab2682' 
  AND token = '2xlD3iEXOWVUcuE/l3MgN/8ab+GTjw0ClPm4VQJU/h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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