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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbafc3ec40e10b4a64c1e040d83ad0984aa8eff04851b784ebfd0a53c96394d' 
  AND token = '8I0nv5RPChELT9BieZ+U8ml66d06/Z4qk4DbjpR8eEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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