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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ae39a7887c9834d449ee9cc7af667aa68a4eef42b36673f8349f1589ed4b56' 
  AND token = 'uBQxDWsJyYw0jM/kCVoiUSflEzYe5TODulfEFIQRtfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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