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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3875ed2138f628e7266208ce1fb1374590c0cb05e5e43768ba7effde9b535772' 
  AND token = '29jV/OZXEdkEsBRPa70imGoQaLcbIOoGaq8kU/xLLvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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