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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d8247c29cf8a148e508961107f4985748c7cb5a485a068d26f7abf323ad504' 
  AND token = '/Uyg8kRPnENQLG23zT/E+XxdILWxjeVgNoIAKSi692g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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