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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab267b931c1e2821a44b7f7e16c6d971fda3456f0d7ba411cdb8f13e43d32aaf' 
  AND token = '468c3pZpblY9GcM9tU0vmlSuA0Cxgf5U4scqfXKEI6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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