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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686e8a9b602bc8e810b5fd52b3079e7a5612d41d4e6ddcf7422a25a88e8c32b4' 
  AND token = 'jqeaXAgklA5cVPJ45ZtUhilZgOFipuJZgbiKHNNBNIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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