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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85b880c7d41df6ce2e3461ee8bf89b8f8b9f244a98f07b889fdd1f50e36c2e2' 
  AND token = '/LlZgAr4gs5bl45RNoveDw0H5EUD3A2tunjzOEhjCkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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