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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc7a2481d9f441ac23647ebd7b5270763f9f3ac43ae377166552be9b9a53edf' 
  AND token = 'Pf/ztYZrQe6B1ZthOxblKSN15cnrjLkE4LviPiHaU38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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